Trump previously said his personal relationship with Putin would usher in peace for Ukraine. Now, he says Putin's gone "absolutely CRAZY!"

The U.S. president lashed out at the Kremlin on Tuesday as the White House continued to consider increasing sanctions against Russia.

President Trump and Russian officials are engaged in a war of words, a sign of escalating tensions between the two powers as Trump grows increasingly frustrated over the lack of progress toward a ceasefire in Ukraine.